Fog for western parts of Sydney on one of the warmer mornings of the past week. A relatively warmer start for Sydneysiders this morning as the mercury only dropped to 14.4 degrees overnight. While it is only three degrees above average it felt warmer following a run of below average mornings in the wake of last weeks cold snap. It was warmer overnight as cloudy skies kept a bit of heat in, while light northerly winds took that crisp edge out of the air. Fog formed in western parts of Sydney last night and early this morning. Visibility reduced down to as low as 100 metres for Richmond, 150 metres at Holsworthy, 500 metres at Canterbury and 900 metres at Bankstown. Further east patches of fog formed in some valleys, although it was not as widespread. Winds remained light until the mid morning allowing fog to linger well after sunrise for some parts of Sydney. Visibility was still being affected by mist at 9:30am for Holsworthy, Prospect Dam and Bankstown although most of it had cleared by 11am. Fog formed this morning due to the combination of lingering moisture, from yesterday's showers, and light winds, under a high pressure system. Fog is unlikely to form tomorrow morning as northwesterly winds will be too strong. This northwesterly breeze will moderate the temperature only allowing the temperature to drop to the mid teens overnight despite skies being clearer.